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    The Association Between Different Night Shiftwork Factors and Breast Cancer: a Case–Control Study

    Access Status
    Fulltext not available
    Authors
    Fritschi, Lin
    Erren, T.
    Glass, D.
    Girschik, J.
    Thomson, A.
    Saunders, C.
    Boyle, T.
    El-Zaemey, S.
    Rogers, P.
    Peters, S.
    Slevin, Terry
    D'Orsogna, A.
    de Vocht, F.
    Vermeulen, R.
    Heyworth, J.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Fritschi, L. and Erren, T. and Glass, D. and Girschik, J. and Thomson, A. and Saunders, C. and Boyle, T. et al. 2013. The Association Between Different Night Shiftwork Factors and Breast Cancer: a Case–Control Study. British Journal of Cancer. 109: pp. 2472-2480.
    Source Title
    British Journal of Cancer
    Additional URLs
    http://www.bjcancer.com/
    ISSN
    00070920
    URI
    http://hdl.handle.net/20.500.11937/47955
    Collection
    • Curtin Research Publications
    Abstract

    Background: Research on the possible association between shiftwork and breast cancer is complicated because there are many different shiftwork factors, which might be involved including: light at night, phase shift, sleep disruption and changes in lifestyle factors while on shiftwork (diet, physical activity, alcohol intake and low sun exposure).Methods: We conducted a population-based case–control study in Western Australia from 2009 to 2011 with 1205 incident breast cancer cases and 1789 frequency age-matched controls. A self-administered questionnaire was used to collect demographic, reproductive, and lifestyle factors and lifetime occupational history and a telephone interview was used to obtain further details about the shiftwork factors listed above.Results: A small increase in risk was suggested for those ever doing the graveyard shift (work between midnight and 0500 hours) and breast cancer (odds ratio (OR)¼1.16, 95% confidence interval (CI)¼0.97–1.39). For phase shift, we found a 22% increase in breast cancer risk (OR¼1.22, 95% CI¼1.01–1.47) with a statistically significant dose–response relationship (P¼0.04). For the other shiftwork factors, risks were marginally elevated and not statistically significant. Conclusion: We found some evidence that some of the factors involved in shiftwork may be associated with breast cancer but the ORs were low and there were inconsistencies in duration and dose–response relationships.

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